Circuit tester



FIG. 1 is a bottom plan view of a circuit tester showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a right side elevational view; and

FIG. 6 is a left side elevational view thereof. 

The ornamental design for a circuit tester, as shown. 